A New Jersey man secretly video-recorded adults and children while they were in the bathroom of a rented Poconos vacation cabin in late 2013, police said Monday.

Kenneth D. Schiff, 51, of Somerset collected nearly 500 video clips from a surveillance camera hidden in what appeared to be smoke detector hanging in a bathroom, state police at Swiftwater said.

Schiff was charged with invasion of privacy and sexual abuse of children from Dec. 28, 2013, to Jan. 1, 2014, for allegedly making the videos at the Lake Harmony cabin.

The victims became suspicious, police said, when they learned that Schiff was arrested earlier for planting cameras in bathrooms and showers of several public campgrounds, police said.

State police at Swiftwater contacted police in Franklin Township, New Jersey, to help obtain a search warrant for Schiff's home, police said. And at his home, police said, they found a video camera built into a smoke detector frame.

Police also found a laptop computer at Schiff's home, police said. The computer was sent to the state police Computer Crime Lab, which examined its contents over the last year.

The lab returned its analysis of the video on Jan. 22.

Police said that, at the time of the hidden videos at Lake Harmony, Schiff already was awaiting sentencing on similar offenses in Monroe County.

Schiff is serving a two-year prison sentence for invasions of privacy.

Police asked that anyone with further information on the hidden video incidents contact Trooper Brian V. Noll at Swiftwater at 570-839-7701.